Hello guys, I'm having a weird issue with my rMBP 15'' 2013, CPU i7 2.7ghz, RAM 16gb, SSD 512gb (Sandisk stock). When my laptop is hooked up to my external 23'' generic monitor via an original Apple miniDisplayPort to VGA adapter, and I do some disk intensive tasks (like iphoto photo imports, application setups, SSD benchmarks etc) my external monitor flickers, in the sense that it shows some fast electrical distortion all over the screen (like it doesn't turn off and on, like some youtube videos show referring to flickering). The distortion is minor but very noticeable, it reminds me of the old CRT monitors flicker... Nothing happens with my previous MacBooks (1 air, 1 mbp13, 1 mbp15, all 2010) and the same adapter/monitor setup. On the retina integrated display there's nothing wrong at all! What do you guys think it is? Anyone experienced this?